Fix test_poll.py.  By Christian Heimes.
diff --git a/Lib/test/test_poll.py b/Lib/test/test_poll.py
index 6fbe1b6..4801640 100644
--- a/Lib/test/test_poll.py
+++ b/Lib/test/test_poll.py
@@ -25,7 +25,7 @@
         p = select.poll()
 
         NUM_PIPES = 12
-        MSG = " This is a test."
+        MSG = b" This is a test."
         MSG_LEN = len(MSG)
         readers = []
         writers = []